Comparative analysis of vocal fold vibration using high-speed videoendoscopy and digital kymography.

Objectives: To compare high-speed videoendoscopy (HSV) and digital kymography (DKG) in the vocal fold vibration analysis of normophonic women with no vocal fold abnormalities.

Study Design: Prospective study comparing quantitative parameters extracted by HSV and DKG.

Methods: Eighteen normophonic women whose age ranged from 18 to 45 years participated in the study. The procedures comprised HSV and DKG of the medial line of the vocal folds. The parameters evaluated were fundamental frequency (F0), open quotient (OQ), and duration of vibration cycle phases (open phase, closed phase, opening phase, and closing phase).

Results: The F0 results of HSV and DKG were similar. However, significant differences were found in both duration of vibration cycle phases and OQ, indicating a longer open phase in the vocal fold vibration when this phase was measured by HSV.

Conclusions: The results emphasize the need to set up different normative threshold values for both HSV and DKG.